latencies affect speed only to a certain point. there are many other factors affecting speed and data transfer. just like clock speed with processors. think about amd and intel. amd's run at a lot slower clock speeds, but they are faster than intels. same with the memory, latencies are not everything, you have to consider the fsb, their clock speed, the motherboards and cpu's memory processing (intels are faster than amds when it comes to memory processing-except the fx series) and things like this.